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- 1. Multiple Choice
This picture is an example of a ___________Step- Up TransformerStep- Down TransformerMotorGenerator - 2. Multiple Choice
Why is electricity transmitted in high voltages from the power stations?
To overcome the high resistance of the wires
To ensure that every household gets the electricity
To reduce power loss
To increase efficiency
- 3. Multiple ChoiceThe image shows an electric energy production and transfer system.Three transformers are labeled in the image. Which statement can be true?ATransformer 1 will step up the voltage, and transformers 2 and 3 will step down the voltage.Transformers 1 and 2 will step up the voltage, and transformer 3 will step down the voltage.Transformer 3 will step up the voltage, and transformers 1 and 2 will step down the voltage.Transformers 2 and 3 will step up the voltage, and transformer 1 will step down the voltage.
- 4. Multiple ChoiceThe figure shows how electrical energy is transferred to a house from a power station.Which statement describes the role of the transformer?It stores the electrical energy for future use.It generates electrical energy.It converts the electrical energy to higher or lower voltages.It converts electrical energy to other forms of energy.
- 5. Multiple Choice
Choose all of the generators
- 6. Multiple Choice
Choose all of the motors.
- 7. Multiple Choice
How does a motor work?
Current generates an electric field around the loop of wire. The electric force causes the loop of wire to rotate.
Current generates a magnetic field in the loop of wire that is then attracted and repelled by the magnet(s) in the motor.
The magnets in the motor attract and repel the metal in the copper wire that makes up the loop. This causes the loop to rotate.
- 8. Multiple Choice
Generators are devices that convert _____ energy into _____ energy.
chemical; mechanical
kinetic; electrical
electrical; mechanical
potential; kinetic
- 9. Multiple Choice
What did Faraday discover about Induction?
That a changing magnetic field induces a current in a conductor.
That electricity and magnetism were related when he noticed a current carrying conductor deflected the compass of a needle.
That the Earth's magnetosphere deflected charged particles from the sun known as solar winds.
That alternating current could be manipulated with transformers.
- 10. Multiple Choice
If you brought an unknown pole of a magnet near a South magnetic pole and they attract.
what is the unknown pole?
North
South
Neutral
not enough information
- 11. Multiple ChoiceIf you wrap more coils around an electromagnet, it will become...brighterstrongerweakerinvisible
- 12. Multiple ChoiceWhat will happen when these magnets are brought close together?They will attract each other.They will repel each other.Both magnets will turn to the leftBoth magnets will turn to the right
- 13. Multiple ChoiceHow could the experimenter increase the amount of electricity being induced by this experiment?Increase the number of coilsDecrease the number of coilsFlip the magnet aroundNothing, the amount of electricity cannot be increased
- 14. Multiple ChoiceWhat benefit is gained by the addition of the iron core in an electromagnet?It makes a strong magnet weakerIt makes a weak magnet strongerThere is no benefit at allIt lets currents interact with each other
- 15. Multiple Choice
A __________ is an electrical device that converts AC electricity from one voltage level to another
transformer
primary coil
secondary coil
center tap
- 16. Multiple ChoiceWill a transformer work with direct current (d.c.) or alternating current (a.c.)?a.c. onlyd.c. onlyBoth a.c. and d.c.
- 17. Multiple Choice
Which of the following is a device that converts electrical energy into kinetic energy?
generator
transformer
magnet
motor
- 18. Multiple ChoiceWhen the coil is part of a d.c. motor, what must be connected directly to X and Y?d.c. supplyslip ringssoft-iron coresplit-ring commutator
- 19. Multiple ChoiceA wire hangs between the poles of a magnet.
When there is a current in the wire, in which direction does the wire move?ABCD - 20. Multiple ChoiceAn alternating current is passed through a wire stretched between the poles of a magnet.
Which way will the wire move?left and rightright onlyup and downup only - 21. Multiple ChoiceThe diagram shows a two-pole single-coil electric motor.
The split-ring commutator reverses the current in the coil as it rotates.How many times is the current reversed if the coil is rotated once?1234 - 22. Multiple ChoiceWhich of the following has no effect on the size of the turning effect on the coil of an electric motor?the size of the current in the coilthe direction of the current in the coilthe number of turns in the coilthe strength of the magnetic field
- 23. Multiple Choice
What direction is the force/motion in the following diagram?
Perpendicular to the magnets
Downwards
Parallel and through the magnets
- 24. Multiple Choice
What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?
180
45
90
270
- 25. Multiple Choice
Name one factor that does not affect the size of a force in on a current-carrying conductor placed in a magnetic field?
Gravity
Strength of magnetic field
Size of the current
Length of the conductor
- 26. Multiple ChoiceThe process of generating the current in a conductor is called asElectro motive forceElectromagnetic inductiongenerator energy conversioninduced voltage
- 27. Multiple ChoiceAC generators have2 slip rings1 slip ring3 slip rings4 slip rings
- 28. Multiple Choice
A
B
C
D
- 29. Multiple Choice
A
B
C
D
- 30. Multiple Choice
A
B
C
D
- 31. Multiple Choice
A
B
C
D
- 32. Multiple Choice
A
B
C
D
- 33. Multiple Choice
A
B
C
D
- 34. Multiple Choice
When does the Output Voltage becomes -5?
When the coil has rotated 90 degrees
When the coil has rotated 180 degrees
When the coil has rotated 270 degrees
When the coil has rotated 135 degrees
- 35. Multiple Choice
Which of the following increases frequency of AC?
increasing number of turns on the coil
using a stronger magnet
rotating the coil faster
increase area of the coil
- 36. Multiple ChoiceIf a secondary coil has 40 turns, and, a primary coil with 20 turns is charged with 50 V of potential difference, then potential difference in secondary coil would be50 V in secondary coil25 V in secondary coil60 V in secondary coil100 V in secondary coil
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